rmmod 11_wait_queue.ko; insmod 11_wait_queue.ko

rmmod 12_wait_block_read.ko; insmod 12_wait_block_read.ko; chmod 0666 /dev/chardev

# 读
head -c 8 /dev/chardev
# 写 
echo -n "abcdef" > /sys/kernel/example/data


rmmod 13_wait_queue_poll_wait.ko; insmod 13_wait_queue_poll_wait.ko; chmod 0666 /dev/chardev

rmmod 14_select.ko; insmod 14_select.ko; chmod 0666 /dev/chardev